The following bar graph shows the number of houses (out of 100) in a town using different types of fuels for cooking. Read the bar graph and answer the following questions:

Scale: 1 unit length = 5 houses

(a) Which fuel is used in maximum number of houses? (b) How many houses are using coal as fuel? (c) Suppose that the total number of houses in the town is 1 lakh. From the above graph estimate the number of houses using electricity.